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Dessert

Chocolate Nut Bar

A baked chocolate and walnut bar made with eggs, butter, sugar, flour, chocolate, and walnuts.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Chocolate and walnut are a kitchen classic. They rank in the top 10% of all ingredient pairs, and cooks put them together in 1,548 recipes. Both carry 3-ethyl-2,5-dimethylpyrazine, which smells roasted, nutty. The science ↓

Chocolate Nut Bar

Ingredients

Directions

The book gives no oven temperature. The 300°F (150°C) in the steps was added when the recipe was transcribed, as a starting point.

Prepare and mix

  1. Preheat the oven to 300°F (150°C).

  2. In a bowl, mix together the eggs, melted butter, sugar, flour, chocolate, and walnut meats until well combined.

  3. Pour the mixture into a shallow pan.

Bake and serve

  1. Bake slowly until set.

  2. Cut into squares while warm.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

  1. Chocolate + walnuttop 10% of all pairs
    Smell alikemoderate
    Cooked together1,548 recipes

    Shared aroma: 3-ethyl-2,5-dimethylpyrazine (roasted, nutty).

  2. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  3. Flour + walnuttop 12% of all pairs
    Smell alikemoderate
    Cooked together5,873 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Sugar + chocolatetop 13% of all pairs
    Smell alikemoderate
    Cooked together15,404 recipes

    Shared aroma: guaiacol (smoky, sweet).

  5. Walnut + meattop 13% of all pairs
    Smell alikemoderate
    Cooked together1,035 recipes

    Shared aroma: 2,4-decadienal (seaweed).

Butter and flour barely smell alike, yet cooks put them together in 124,287 recipes: they work on texture and structure more than aroma.

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Eggs
Bind the batter and set into a firm, sliceable structure as they cook.
Butter
Adds fat for a rich, tender texture and moisture.
Sugar
Sweetens the bar and adds moisture and a chewy texture.
Flour
Provides the structure that holds the bar together when set.
Chocolate
Adds deep chocolate flavour and fat that keeps the bar moist.
Walnut meats
Add crunch and a toasty, nutty flavour against the soft interior.

The step that matters

Bake slowly until set. Low, gentle heat sets the egg and flour proteins evenly without over-firming them. Baking too hot can make the bar dry, rubbery, or cracked, and underbaking leaves it wet in the centre. Judge doneness by the surface being set, not by a fixed time.

Swap the walnut

How well each one fits the dish's main ingredients (egg, butter, sugar, flour, chocolate, meat):

  1. Almondfits better
  2. Pecansfits about as well
  3. Walnutthe original
  4. Chestnutfits about as well

Fit is the average pairing score against egg, butter, sugar, flour, chocolate, meat. Candidates are from the same food group and used in at least 100 recipes.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.

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